If you try to SS Photon Emperor by discarding it with Galaxy Solder, its effect does not trigger!
I tested it in Master Duells, EdoPro, and it works there just fine.
In Omega, the Emperor stays in the grave, and you don’t get your SS or extra NS of.
The effect works just fine, if you discard him other ways.
I’m pretty sure, I saw another Bug with the Photon Deck I was experimentalizing with, but I can’t remember, I will create a new Post, if I know more.